Abstract
Sporormiella spores found in Pleistocene-age dung specimens, which were recovered from Appleman Lake in Indiana, are helping to explain what led to the sudden disappearance of 135 species of Pleistocene animals in North America between 14,800 and 13,700 years ago, according to Jacquelyn Gill from the University of Wisconsin, Madison, and her collaborators. Although their report in the November 20th Science does not say exactly what abruptly killed off several dozen species, it tends to rule out two leading hypotheses that sought to explain those extinctions. The arrival of humans in North America during this period was likely behind the demise of those species, she suggests.
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